function openWindow(url, name)

{  var laenge, hoehe, x, y;
   laenge = 790;
  hoehe = 500;
   x = screen.availWidth/2 - 395;
   y = screen.availHeight/2 - 38;

   var extraFenster = window.open(url, name, "height="+hoehe+",width="+laenge+",left="+x+",top="+y+",scrollbars=yes,locationbar=no");}

function openMp3Window(url,name)

{  var laenge, hoehe, x, y;
   laenge = 80;
   hoehe = 20;
   x = screen.availWidth/2 - 395;
   y = screen.availHeight/2 - 38;

   var extraFenster = window.open(url, name, "height="+hoehe+",width="+laenge+",left="+x+",top="+y+",scrollbars=yes,locationbar=no");}